Describe the similarities and differences between sperm and ova.
What will be an ideal response?
Sperm are haploid, small, and motile. Oocytes are technically diploid (until fertilization when ½ of DNA is kicked out), large, and non-motile. Ova contribute the cytoplasm to the zygote.
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Which of the following is likely to have the most toxic side effects to humans?
A. Inhibitors of protein synthesis B. Inhibitors of DNA synthesis C. Disrupters of cell membrane structure D. Inhibitors of cell wall synthesis
Based on the fossil record, ____ evolved about 1.8 million years ago and made fairly sophisticated tools, including the
hand axe.
a. Homo habilis b. Homo erectus c. Australopithecus africanus d. Australopithecus afarensis e. Homo neanderthalensis
At about how many weeks of gestation do the sex organs of a fetus develop?
a. Five b. Six c. Seven d. Eight
The first cell of a new individual is the
a. blastula. b. gastrula. c. embryo. d. zygote. e. gamete